- Plesk Onyx for Linux
Unable to install Plesk updates:
dpkg: error processing archive /var/cache/apt/archives/mailman_1%3a2.1.20-1ubuntu0.1_amd64.deb (--unpack):
subprocess new pre-installation script returned error exit status 1
No updates required.
insserv: warning: current stop runlevel(s) (0 1 6) of script `mailman' overrides LSB defaults (empty).
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)
System mailman package is outdated
Create a backup of the following directory:
cp -p -r /var/lib/mailman/qfiles ./
Remove all files in
Run Plesk installer again. If it does not help, upgrade system packages:
# apt-get upgrade
For further assistance, contact your system administrator as Plesk does not ship